How should I remove all elements in a DbSet?

Question

What\'s the best way to remove all elements in a System.Data.Entity.DbSet, with Entity Framework 4.3?

Answer 1

As the accepted answer only mentions about the method below:

context.Database.ExecuteSqlCommand("delete from MyTable");

and rather gives alternatives to it, I've managed to write a method, which you can use to avoid loading all entities, then looping through them and use ExecuteSqlCommand instead.

Assuming using unit of work, where context is DbContext:

using System.Data.Entity.Core.Objects;
using System.Text.RegularExpressions;

public void DeleteAll()
{
    ObjectContext objectContext = ( (IObjectContextAdapter)context ).ObjectContext;
    string sql = objectContext.CreateObjectSet().ToTraceString();
    Regex regex = new Regex( "FROM (?.*) AS" );
    Match match = regex.Match( sql );
    string tableName = match.Groups[ "table" ].Value;

    context.Database.ExecuteSqlCommand( string.Format( "delete from {0}", tableName ) );
}
First block of code retrievs the table name needed in ExecuteSqlCommand method.
Usage:
using ( var context = new UnitOfWork() )
{
    context.MyRepository.DeleteAll();
}
There's no need to call 
context.SaveChanges()

                                                        

              
                
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